diff options
Diffstat (limited to '')
| -rw-r--r-- | web/server/h2o/libh2o/lib/handler/errordoc.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/web/server/h2o/libh2o/lib/handler/errordoc.c b/web/server/h2o/libh2o/lib/handler/errordoc.c new file mode 100644 index 00000000..72744f35 --- /dev/null +++ b/web/server/h2o/libh2o/lib/handler/errordoc.c @@ -0,0 +1,145 @@ +/* + * Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to + * deal in the Software without restriction, including without limitation the + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ +#include "h2o.h" + +/* used to rewrite status code to the original code */ +struct st_errordoc_prefilter_t { + h2o_req_prefilter_t super; + h2o_headers_t req_headers; + int status; + const char *reason; + h2o_headers_t res_headers; +}; + +/* used to capture an error response */ +struct st_errordoc_filter_t { + h2o_filter_t super; + H2O_VECTOR(h2o_errordoc_t) errordocs; +}; + +static void add_header(h2o_mem_pool_t *pool, h2o_headers_t *headers, const h2o_header_t *header) +{ + h2o_vector_reserve(pool, headers, headers->size + 1); + headers->entries[headers->size++] = *header; +} + +static void on_prefilter_setup_stream(h2o_req_prefilter_t *_self, h2o_req_t *req, h2o_ostream_t **slot) +{ + struct st_errordoc_prefilter_t *self = (void *)_self; + h2o_headers_t headers_merged = {NULL}; + size_t i; + + /* restore request headers (for logging) and response status */ + req->headers = self->req_headers; + req->res.status = self->status; + req->res.reason = self->reason; + + /* generate response headers (by merging the preserved and given) */ + for (i = 0; i != self->res_headers.size; ++i) + add_header(&req->pool, &headers_merged, self->res_headers.entries + i); + for (i = 0; i != req->res.headers.size; ++i) { + const h2o_header_t *header = req->res.headers.entries + i; + if (header->name == &H2O_TOKEN_CONTENT_TYPE->buf || header->name == &H2O_TOKEN_CONTENT_LANGUAGE->buf || + header->name == &H2O_TOKEN_SET_COOKIE->buf) + add_header(&req->pool, &headers_merged, header); + } + req->res.headers = headers_merged; + + h2o_setup_next_prefilter(&self->super, req, slot); +} + +static void on_ostream_send(h2o_ostream_t *self, h2o_req_t *req, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state) +{ + /* nothing to do */ +} + +static int prefilter_is_registered(h2o_req_t *req) +{ + h2o_req_prefilter_t *prefilter; + for (prefilter = req->prefilters; prefilter != NULL; prefilter = prefilter->next) + if (prefilter->on_setup_ostream == on_prefilter_setup_stream) + return 1; + return 0; +} + +static void on_filter_setup_ostream(h2o_filter_t *_self, h2o_req_t *req, h2o_ostream_t **slot) +{ + struct st_errordoc_filter_t *self = (void *)_self; + h2o_errordoc_t *errordoc; + struct st_errordoc_prefilter_t *prefilter; + h2o_iovec_t method; + h2o_ostream_t *ostream; + size_t i; + + if (req->res.status >= 400 && !prefilter_is_registered(req)) { + size_t i; + for (i = 0; i != self->errordocs.size; ++i) { + errordoc = self->errordocs.entries + i; + if (errordoc->status == req->res.status) + goto Found; + } + } + + /* bypass to the next filter */ + h2o_setup_next_ostream(req, slot); + return; + +Found: + /* register prefilter that rewrites the status code after the internal redirect is processed */ + prefilter = (void *)h2o_add_prefilter(req, sizeof(*prefilter)); + prefilter->super.on_setup_ostream = on_prefilter_setup_stream; + prefilter->req_headers = req->headers; + prefilter->status = req->res.status; + prefilter->reason = req->res.reason; + prefilter->res_headers = (h2o_headers_t){NULL}; + for (i = 0; i != req->res.headers.size; ++i) { + const h2o_header_t *header = req->res.headers.entries + i; + if (!(header->name == &H2O_TOKEN_CONTENT_TYPE->buf || header->name == &H2O_TOKEN_CONTENT_LANGUAGE->buf)) + add_header(&req->pool, &prefilter->res_headers, header); + } + /* redirect internally to the error document */ + method = req->method; + if (h2o_memis(method.base, method.len, H2O_STRLIT("POST"))) + method = h2o_iovec_init(H2O_STRLIT("GET")); + req->headers = (h2o_headers_t){NULL}; + req->res.headers = (h2o_headers_t){NULL}; + h2o_send_redirect_internal(req, method, errordoc->url.base, errordoc->url.len, 0); + /* create fake ostream that swallows the contents emitted by the generator */ + ostream = h2o_add_ostream(req, sizeof(*ostream), slot); + ostream->do_send = on_ostream_send; +} + +void h2o_errordoc_register(h2o_pathconf_t *pathconf, h2o_errordoc_t *errdocs, size_t cnt) +{ + struct st_errordoc_filter_t *self = (void *)h2o_create_filter(pathconf, sizeof(*self)); + size_t i; + + self->super.on_setup_ostream = on_filter_setup_ostream; + h2o_vector_reserve(NULL, &self->errordocs, cnt); + self->errordocs.size = cnt; + for (i = 0; i != cnt; ++i) { + const h2o_errordoc_t *src = errdocs + i; + h2o_errordoc_t *dst = self->errordocs.entries + i; + dst->status = src->status; + dst->url = h2o_strdup(NULL, src->url.base, src->url.len); + } +} |